You would have to consider supply as well. There will only ever be one original painting, while you can print it as many times as you want. If something is unique it is usually much more valuable than something (in the same category) that can be reproduced endlessly. You would not compare a unique sculpture to a 747. A small supply increases demand, and an increase in demand increases cost.
Prints are usually much cheaper than an artists original. Most of the time when you buy a piece of art, you're buying a print. With artists that are in great demand, the print run will be numbered. Lower numbers are usually more prized and will cost more than higher number prints. This stems from the idea that the earlier the print was made in the run, the better the quality… which is true of traditional Photography and Lithography.
You would have to consider supply as well. There will only ever be one original painting, while you can print it as many times as you want. If something is unique it is usually much more valuable than something (in the same category) that can be reproduced endlessly. You would not compare a unique sculpture to a 747. A small supply increases demand, and an increase in demand increases cost.
Prints are usually much cheaper than an artists original. Most of the time when you buy a piece of art, you're buying a print. With artists that are in great demand, the print run will be numbered. Lower numbers are usually more prized and will cost more than higher number prints. This stems from the idea that the earlier the print was made in the run, the better the quality… which is true of traditional Photography and Lithography.